angela merkel is seen as the key player here. that's because germany is the biggest trade partner with russia. germany is russia's largest trading partner with europe. more than twice the entire trade of the united states comes through germany. as one senior official told me just a short while ago, there's no question that economic sanctions are more effective when they're done in coordination with europe. if the united states is going to go forward with another round of broader sanctions against germany -- against russia, germany has got to be there with the u.s. >> there's been a lot of pushback from corporations, both here and in germany. >> reporter: yeah. there's no question about that. germany has been a reluctant partner here. it's not just the corporations that have deep ties with russia. it's also oil and gas. germany gets one-third of its oil, one-third of its gas from russia. they have a lot to lose with tougher sanctions. >> thanks very much. we will have more on this sunday on "this week". >>> let's go to amy with to